Etymology
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bias (n.)

1520s, "oblique or diagonal line," from French biais "a slant, a slope, an oblique," also figuratively, "an expedient, means" (13c., originally in Old French a past-participle adjective, "sideways, askance, against the grain"), a word of unknown origin. Probably it came to French from Old Provençal biais, which has cognates in Old Catalan and Sardinian, and is possibly via Vulgar Latin *(e)bigassius from Greek epikarsios "athwart, crosswise, at an angle," from epi "upon" (see epi-) + karsios "oblique" (from PIE *krs-yo-, suffixed form of root *sker- (1) "to cut").

In the old game of bowls, it was a technical term used in reference to balls made with a greater weight on one side (1560s), causing them to curve toward one side; hence the figurative use "a one-sided tendency of the mind" (1570s), and, at first especially in law, "undue propensity or prejudice."

The bias of education, the bias of class-relationships, the bias of nationality, the political bias, the theological bias—these, added to the constitutional sympathies and antipathies, have much more influence in determining beliefs on social questions than has the small amount of evidence collected. [Herbert Spencer, "The Study of Sociology," 1873]
For what a man had rather were true he more readily believes. Therefore he rejects difficult things from impatience of research; sober things, because they narrow hope; the deeper things of nature, from superstition; the light of experience, from arrogance and pride, lest his mind should seem to be occupied with things mean and transitory; things not commonly believed, out of deference to the opinion of the vulgar. Numberless in short are the ways, and sometimes imperceptible, in which the affections colour and infect the understanding. [Francis Bacon, "Novum Organum," 1620]
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bias (v.)
"giving a bias to, causing to incline to one side," 1610s literal; 1620s figurative; from bias (n.). Compare French biasier. Related: Biased; biasing.
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biased (adj.)
1610s in reference to bowling, 1660s in reference to persons; past-participle adjective from bias (v.). The simple bias also formerly was used as an adjective.
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unbias (v.)

"to free from bias," 1708, from un- (2) "reverse, opposite of" + bias (v.).

The truest service a private man may hope to do his country is, by unbiassing his mind as much as possible. [Swift, "The Sentiments of a Church of England Man with respect to Religion and Government," 1708]
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*sker- (1)

also *ker-, Proto-Indo-European root meaning "to cut."

It forms all or part of: bias; carnage; carnal; carnation; carnival; carnivorous; carrion; cenacle; charcuterie; charnel; corium; cortex; crone; cuirass; currier; curt; decorticate; excoriate; incarnadine; incarnate; incarnation; kirtle; scabbard; scar (n.2) "bare and broken rocky face of a cliff or mountain;" scaramouche; scarf (n.2) "connecting joint;" scarp; score; scrabble; scrap (n.1) "small piece;" scrape; screen; screw; scrimmage; scrofula; scrub (n.1) "low, stunted tree;" scurf; shard; share (n.1) "portion;" share (n.2) "iron blade of a plow;" sharp; shear; shears; sheer (adj.) "absolute, utter;" shirt; shore (n.) "land bordering a large body of water;" short; shrub; skerry; skirmish; skirt.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit krnati "hurts, wounds, kills," krntati "cuts;" Hittite karsh- "to cut off;" Greek keirein "to cut, shear;" Latin curtus "short;" Lithuanian skiriu, skirti "to separate;" Old English sceran, scieran "to cleave, hew, cut with a sharp instrument;" Old Irish scaraim "I separate;" Welsh ysgar "to separate," ysgyr "fragment."

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impartiality (n.)
"fairness, freedom from bias," 1610s; see impartial + -ity.
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prepossessing (adj.)

1640s, "causing bias or prejudice, predisposing the mind to favor," present-participle adjective from prepossess. Opposite meaning "causing agreeable first impression" is attested by 1805.

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ableism (n.)
by 1990 in feminist and lesbian literature, from able (adj.) + -ism. Defined in 1991 as "bias against the physically challenged and differently abled (formerly the disabled or handicapped) by the temporarily abled. The phrase 'blind to the truth' would be an example of ableist language." [U.S. News & World Report, vol. 110] Related: Ableist.
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sage (n.2)

"wise man, man of profound wisdom, venerable man known as a grave philosopher," mid-14c., from sage (adj.). Originally applied to the Seven Sages — Thales, Solon, Periander, Cleobulus, Chilon, Bias, and Pittacus — men of ancient Greece renowned for practical wisdom.

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preoccupation (n.)

1550s, "state of occupying or seizing beforehand," from Latin praeoccupationem (nominative praeoccupatio) "a seizing beforehand, anticipation," noun of action from past-participle stem of praeoccupare, from prae "before" (see pre-) + occupare "seize" (see occupy). Meaning "prior mental absorption" is from 1854. Earlier its secondary sense was "bias, prejudice" (c. 1600).

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